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Nano Research

Article Title

Photocatalytic, recyclable CdS nanoparticle-carbon nanotube hybrid sponges

Authors

Hongbian Li, Department of Advanced Materials and Nanotechnology, College of Engineering, Peking University, Beijing 100871, China
Xuchun Gui, State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China
Chunyan Ji, Department of Advanced Materials and Nanotechnology, College of Engineering, Peking University, Beijing 100871, China
Peixu Li, Key Laboratory for Advanced Materials Processing Technology and Department of Mechanical Engineering, Tsinghua University,Beijing 100084, China 
Zhen Li, Key Laboratory for Advanced Materials Processing Technology and Department of Mechanical Engineering, Tsinghua University,Beijing 100084, China 
Luhui Zhang, Department of Advanced Materials and Nanotechnology, College of Engineering, Peking University, Beijing 100871, China
Enzheng Shi, Department of Advanced Materials and Nanotechnology, College of Engineering, Peking University, Beijing 100871, China
Ke Zhu, Key Laboratory for Advanced Materials Processing Technology and Department of Mechanical Engineering, Tsinghua University,Beijing 100084, China 
Jinquan Wei, Key Laboratory for Advanced Materials Processing Technology and Department of Mechanical Engineering, Tsinghua University,Beijing 100084, China 
Kunlin Wang, Key Laboratory for Advanced Materials Processing Technology and Department of Mechanical Engineering, Tsinghua University,Beijing 100084, China 
Hongwei Zhu, Key Laboratory for Advanced Materials Processing Technology and Department of Mechanical Engineering, Tsinghua University,Beijing 100084, China 
Dehai Wu, Key Laboratory for Advanced Materials Processing Technology and Department of Mechanical Engineering, Tsinghua University,Beijing 100084, China 
Anyuan Cao, Department of Advanced Materials and Nanotechnology, College of Engineering, Peking University, Beijing 100871, China

Keywords

Hybrid nanostructure, carbon nanotube, nanoparticle, photocatalysis, adsorption

Abstract

ABSTRACT Semiconducting nanoparticles with lower bandgap (e.g., CdS) are alternative photocatalysts to TiO2, since they have a potentially wider range light of absorption and improved catalytic efficiency. However, they must be securely anchored on a porous substrate for practical applications. Here, we report a hybrid porous photocatalyst fabricated by grafting 4–6 nm diameter CdS nanoparticles uniformly throughout the entire macroporous structure of a three-dimensional carbon nanotube (CNT) sponge. The unique feature of our structure is that only the CdS nanoparticles grafted on the outside surface are active in photocatalysis, while other nanoparticles are stored inside the sponge in the fresh state for use when the catalyst is recycled. Our CdS–CNT hybrid sponges show high efficiency in removing organic contaminants from water. Spectroscopic measurements show that the hybrid sponges are multifunctional, simultaneously performing organic molecular adsorption (using the inter-CNT spacing), and photocatalytic decomposition (by the CdS nanoparticles grafted on the surface), both of which contribute to water purification. Furthermore, the surface part of the sponges can be stripped off to expose inner nanoparticles for use when the catalyst is recycled, without performance degradation.

Graphical Abstract

Publisher

Tsinghua University Press

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